The Waimea Canyon in west Kauai is one of the most magnificent sites on the island. It was nicknamed the Grand Canyon of the Pacific by Mark Twain for a really good reason! The Waimea Canyon Kauai is the biggest found in the Pacific and visiting is one of the top things to do. The first look into Waimea Canyon is dramatic and impressive. It may leave you reeling as you witness the plunging rock faces on all sides and realize just how deep it is. Measuring one mile wide, ten miles long and close to 4,000-feet deep, the unfolding scene is breathtaking.